MULTISTAGE CENTRIFUGAL PUMP WITH CANNED MAGNETIC BEARING

摘要

A multistage centrifugal pump for increasing the pressure of a product fluid passing through it. The pump includes a casing (12), an impeller shaft (18) mounted for rotation within the casing (12) and a plurality of impellers (28) mounted back-to-back on the impeller shaft. A canned magnetic radial bearing (26) is mounted around the outboard end (22) of the impeller shaft (18) and a magnetic thrust bearing (44) and a magnetic radial bearing (24) are mounted around the drive end (20) of the impeller shaft. The pump is free of any product fluid return line connecting the product fluid chambers at the drive and outboard ends of the shaft.